Add support for ignoring files

Add ignore.toml, configuration for ignoring files
Add file_filter.py, for matching files against glob/regex patterns
Update relevant code to use file filter
+Tests

pr_agent/algo/file_filter.py

@@ -0,0 +1,23 @@
+import fnmatch
+import re
+
+from pr_agent.config_loader import get_settings
+
+def filter_ignored(files):
+    """
+    Filter out files that match the ignore patterns.
+    """
+
+    # load regex patterns, and translate glob patterns to regex
+    patterns = get_settings().ignore.regex
+    patterns += [fnmatch.translate(glob) for glob in  get_settings().ignore.glob]
+
+    compiled_patterns = [re.compile(r) for r in patterns]
+    filenames = [file.filename for file in files]
+
+    # keep filenames that don't match the ignore regex
+    for r in compiled_patterns:
+        filenames = [f for f in filenames if not r.match(f)]
+
+    # map filenames back to files
+    return [file for file in files if file.filename in filenames]

pr_agent/algo/pr_processing.py

@@ -11,6 +11,7 @@ from github import RateLimitExceededException
 from pr_agent.algo import MAX_TOKENS
 from pr_agent.algo.git_patch_processing import convert_to_hunks_with_lines_numbers, extend_patch, handle_patch_deletions
 from pr_agent.algo.language_handler import sort_files_by_main_languages
+from pr_agent.algo.file_filter import filter_ignored
 from pr_agent.algo.token_handler import TokenHandler, get_token_encoder
 from pr_agent.config_loader import get_settings
 from pr_agent.git_providers.git_provider import FilePatchInfo, GitProvider
@@ -53,6 +54,8 @@ def get_pr_diff(git_provider: GitProvider, token_handler: TokenHandler, model: s
         logging.error(f"Rate limit exceeded for git provider API. original message {e}")
         raise
 
+    diff_files = filter_ignored(diff_files)
+
     # get pr languages
     pr_languages = sort_files_by_main_languages(git_provider.get_languages(), diff_files)
 
@@ -348,16 +351,16 @@ def get_pr_multi_diffs(git_provider: GitProvider,
     """
     Retrieves the diff files from a Git provider, sorts them by main language, and generates patches for each file.
     The patches are split into multiple groups based on the maximum number of tokens allowed for the given model.
-    
+
     Args:
         git_provider (GitProvider): An object that provides access to Git provider APIs.
         token_handler (TokenHandler): An object that handles tokens in the context of a pull request.
         model (str): The name of the model.
         max_calls (int, optional): The maximum number of calls to retrieve diff files. Defaults to 5.
-    
+
     Returns:
         List[str]: A list of final diff strings, split into multiple groups based on the maximum number of tokens allowed for the given model.
-    
+
     Raises:
         RateLimitExceededException: If the rate limit for the Git provider API is exceeded.
     """
@@ -367,6 +370,8 @@ def get_pr_multi_diffs(git_provider: GitProvider,
         logging.error(f"Rate limit exceeded for git provider API. original message {e}")
         raise
 
+    diff_files = filter_ignored(diff_files)
+
     # Sort files by main language
     pr_languages = sort_files_by_main_languages(git_provider.get_languages(), diff_files)